Deryck Whibley drops Avril Lavigne from legal name

TMZ says the Sum 41 frontman has officially changed his last name back to Whibley after taking his ex-wife Avril Lavigne's last name in 2006. The couple divorced in 2010, and Deryck filed to get his original name back after Avril moved on with Chad Kroeger last year.

Avril and Deryck have remained friendly since ending their marriage. The singer shared her public support for Deryck after he collapsed and landed in the hospital due to years of alcohol abuse.

In an update on his website earlier this month, the rocker told fans he's "getting better every day" and working on physical therapy to get him walking on his own.